a few questions about the Su-35

1. Does it have TVC? 3D or just vertical?
2. How many have been bought by the Russian AF?
3. I heard a while back that a few of them would be delivered to the Russian Knights team. Any info on that?
4. What special external features does it have to identify it against, lets say, Su-33? (except the color scheme)

5. And an extra question- Just to make sure, the Su-33 is 1 seater right?
(Because I saw a “serious” source that says its a 2-seater)
http://www.globalsecurity.org/military/world/russia/images/a1143kuzn2.jpg